Well you still need some PO4, K+ and NO3.
GH sounds fine.
You can add lots and lots of PO4 ansd have great pl;ant growth, PO4 is
not the issue that causes algae in planted tanks.
Tap water with 1-2ppm ranges are great, then you don't need to add
KH2PO4.
Regards,
Tom Barr
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